Hi there. I just answered this, it's a Haiku.
Long explanation short, sonnet has ten syllable, free verse has basically no poetic limitations and usually no rhyme or rhythm, and a Limerick has five lines, where lines 1, 2, and 5 have 5-7 syllables and have the same rhyme scheme and verbal rhythm, and lines 3 and 4 have a different rhyme scheme and verbal rhythm from 1, 2 and 5, and have 5-7 syllables.
